I see no color in gradients dialog.

OS is Linux Mint Debian 64 bit.
I installed GIMP 2.7.2 giving it a test drive.
I see no color in gradients and they are transparent in the gradient dialog and editor. The gradients are working using them on the canvas.

Just wondering if anyone has this problem. I know this is a unstable version so I have 2.6 on another partition.